JP5198129B2 - Wheel speed sensor mounting device - Google Patents

Description

  The present invention relates to a wheel speed sensor mounting device that is provided close to a pulsar ring with a predetermined gap and detects the rotational speed of a wheel.

Some vehicles such as motorcycles are equipped with an anti-lock brake system (hereinafter referred to as ABS), and in that case, it is necessary to attach a wheel speed sensor for detecting the rotational speed of the wheel. The wheel speed sensor is provided close to the pulsar ring attached to the side of the rotating wheel in a predetermined gap in the axle direction, and detects the rotational speed of the wheel by detecting the rotational speed of the pulsar ring. Is. Here, as to the mounting structure of the wheel speed sensor, as shown in Patent Document 1, a mounting boss having a mounting hole is integrally provided on a front fork that supports a front wheel of a motorcycle, and the wheel speed sensor is connected to the mounting speed. A structure attached to a boss is disclosed. Patent Document 2 discloses a structure that includes a wheel support member and a collar member that coaxially surrounds the axle between the wheels and a sensor bracket, and a wheel speed sensor is attached to the sensor bracket.
No. 7-17609 JP 2007-1532 A

  The gap between the wheel speed sensor and the pulsar ring (hereinafter referred to as an air gap) is very small (narrow), usually about 1 mm, and needs to be managed appropriately. Here, since the air gap is a gap formed by combining a plurality of parts, high dimensional accuracy is desired for each individual part constituting the air gap in order to appropriately manage the air gap. However, in normal machining, the dimensional accuracy of individual parts is about ± 0.1 mm, and if a dimensional accuracy higher than that is obtained, it causes a cost increase.

  Here, a conventional specific example of air gap management will be described with reference to FIG. FIG. 7 is a side sectional view of a conventional wheel speed sensor mounting structure (hereinafter referred to as conventional structure 1) for a motorcycle front wheel disclosed in Patent Document 2 and the like. As shown in FIG. 7, the air gap G is formed by a gap between the wheel speed sensor 21 and the pulsar ring 22. The pulsar ring 22 is attached to the wheel 14 with bolts 26. The wheel 14 is attached to the outer periphery of the axle 13 via a bearing 24. The mounting device for the wheel speed sensor 21 includes a collar 23 fitted to the outer peripheral surface of the axle 13, a sensor bracket 25 fitted to the outer peripheral surface of the axle 13, and disposed between the front fork 12 and the collar 23. It is equipped with. The wheel speed sensor 21 is attached to the sensor bracket 25 with bolts 28.

  In the conventional structure 1 shown in FIG. 7, the sensor bracket 25 and the collar 23 are formed as separate bodies, and are arranged side by side in the axle direction between the front fork 12 and the bearing 24. In this case, the stacking tolerance in the axle direction on the wheel speed sensor 21 side with respect to the wheel 14 is the tolerance of the axle direction dimension L1 of the bearing 24, the tolerance of the axle direction dimension L2 of the collar 23, and the contact surface of the sensor bracket 25 with the collar 23. To the contact surface with the wheel speed sensor 21 from the contact surface with the sensor bracket 25 to the end surface of the wheel speed sensor 21 facing the pulsar ring 22. The tolerance of the direction dimension L4 will be added. On the other hand, the tolerance on the pulsar ring 22 side is the tolerance of the axial dimension L5 from the contact surface with the bearing 24 on the wheel 14 to the contact surface with the pulsar ring 22 and the tolerance of the axial dimension L6 of the pulsar ring 22. It will be added together. Therefore, the tolerance of the air gap G between the wheel speed sensor 21 and the pulsar ring 22 is the sum of all of the above. For example, if the tolerances of the dimensions L1, L2, L3, and L5 are ± 0.1 mm and the tolerances of the dimensions L4 and L6 are ± 0.15 mm, the stacking tolerance of the air gap G is ± 0. .7mm. That is, in the case where the sensor bracket 25 and the collar 23 are separate, the tolerance of each member (usually about ± 0.1 mm) is stacked on the tolerance of the air gap G, and the air gap G, which is usually managed at about 1 mm, is configured. A tolerance of ± 0.7 mm is generated only by the members, and management of the air gap G is difficult.

  FIG. 8 is a cross-sectional view similar to FIG. 7 of a further conventional wheel speed sensor mounting structure (hereinafter referred to as conventional structure 2) different from FIG. In the conventional structure 2 shown in FIG. 8, since the collar and the sensor bracket are an integrated object 251, the stacking tolerance in the axle direction on the wheel speed sensor 21 side with respect to the wheel 14 is the tolerance of the axle direction dimension L1 of the bearing 24, the collar. The tolerance of the axial dimension L7 from the contact surface with the bearing 24 to the contact surface with the wheel speed sensor 21 in the integrated object 251 of the sensor bracket and the contact with the integrated object 251 in the wheel speed sensor 21 The tolerance of the dimension L4 in the axle direction from the surface to the end surface of the wheel speed sensor 21 facing the pulsar ring 22 is added. On the other hand, the tolerance on the pulsar ring 22 side is the tolerance of the axial dimension L5 from the contact surface with the bearing 24 on the wheel 14 to the contact surface with the pulsar ring 22 and the tolerance of the axial dimension L6 of the pulsar ring 22. It will be added together. Therefore, the tolerance of the air gap G between the wheel speed sensor 21 and the pulsar ring 22 is the sum of the above. For example, if the tolerances of the dimensions L1, L5, and L7 are ± 0.1 mm and the tolerances of the dimensions L4 and L6 are ± 0.15 mm, the stacking tolerance of the air gap G is ± 0.6 mm. It becomes. Therefore, the conventional structure 2 has a stacking tolerance of the air gap G of ± 0.1 mm smaller than that of the conventional structure 1 by integrating the collar and the sensor bracket. That is, when the collar and the sensor bracket are integrated, the stacking tolerance of the air gap G can be reduced as compared with the conventional structure 1 of FIG. However, if a collar that is originally machined into a cylindrical shape and the sealing surface must be finished with precision and a sensor bracket having a complicated shape are molded as an integrated object 251, the manufacturability is reduced, which increases the cost. Also, steel is used because the collar normally requires strength, while light metal is used for weight reduction because the sensor bracket does not require strength. However, in the conventional structure 2 shown in FIG. 8, since the collar and the sensor bracket are an integrated object 251, the same material is used in the integrated object 251, so that the strength design is made according to the color that requires strength. The sensor bracket and the high-strength, expensive light metal must be sacrificed for economy, or all steel should be sacrificed for weight reduction.

  Therefore, an object of the present invention is to provide a wheel speed sensor mounting device that can reduce the stacking tolerance of the air gap G while separating the collar 23 and the sensor bracket 25 from each other.

According to a first aspect of the present invention, there is provided a wheel speed sensor mounting device arranged with a predetermined gap in an axle direction with respect to a pulsar ring fixed to a wheel rotatably supported on an axle. A collar that fits to the outer peripheral surface and is positioned in the axle direction with respect to the wheel; and a sensor bracket that is fitted to the outer peripheral surface of the collar and to which the wheel speed sensor is attached ; The sensor bracket is separate from the sensor bracket. The sensor bracket contacts a locking surface formed on the collar to position the sensor bracket in the axle direction, and the wheel speed sensor A second positioning surface that abuts and positions the wheel speed sensor in the axle direction with respect to the sensor bracket; -Decided Me surface and the second positioning surface, wherein are formed in the axle and the substantially perpendicular coplanar, it is characterized. Here, the term “in the same plane” includes a case in which the plane is substantially in the same plane, and the following description is also the same.

  The said structure WHEREIN: The 1st positioning surface with respect to the collar of a sensor bracket and the 2nd positioning surface with respect to the wheel speed sensor of a sensor bracket are comprised so that it may form in the same plane substantially orthogonal to an axle. As a result, even if a collar and a separate sensor bracket are incorporated, the tolerance of the sensor bracket is not added to the stacking tolerance of the wheel speed sensor, and the tolerance on the wheel speed sensor The tolerance of the wheel speed sensor will be added. As a result, the air gap accumulation tolerance can be reduced as compared with the conventional structure 1 in which the collar and the sensor bracket are separated. In addition, since the sensor bracket and collar can be separated, the air gap stacking tolerance is the same as the conventional structure 2 in which the sensor bracket and collar are integrated, but the structure is more manufacturable and economical. And can.

The first invention of the present application preferably further comprises the following configuration.
(1) The outer diameter of the collar is larger than the outer diameter on the wheel side at the mounting portion of the sensor bracket.
(2) The detent portion of the sensor bracket is fixed on the wheel side of the front fork that supports the axle.

  According to the configuration (1), the outer diameter of the collar is increased at the mounting portion of the sensor bracket. That is, the outer diameter of the collar on the wheel side is smaller than the outer diameter of the collar on the enlarged side, so that when the collar is press-fitted to the sensor bracket, the seal surface between the collar wheel and the sensor bracket It is difficult to touch. As a result, it is difficult to damage the sealing surface of the collar. Further, since the sensor bracket is attached to the side where the diameter of the collar is enlarged, it is advantageous in terms of strength.

  According to the configuration (2), the detent portion of the sensor bracket is fixed on the wheel side of the front fork that supports the axle. Accordingly, the rotation stop portion of the sensor bracket is difficult to see from the outside, and the appearance is excellent.

  A second invention of the present application is a motorcycle provided with the wheel speed sensor mounting device of the first invention.

  According to the said structure, the wheel speed sensor of a motorcycle can be attached to the wheel speed sensor attachment apparatus which reduces the accumulation tolerance of an air gap and the management of an air gap is easy.

  In short, according to the present invention, it is possible to provide a mounting device for a wheel speed sensor that can reduce the air gap accumulation tolerance and can easily manage the air gap.

  FIG. 1 is a side view of a motorcycle 10 according to an embodiment of the present invention. FIG. 2 is an enlarged view of a pulsar ring 22 portion of the front wheel 11 of FIG. In FIG. 1, a front wheel 11 is configured by rotatably supporting a wheel 14 on an axle 13 suspended on a front fork 12 and mounting a tire 15 on the outer periphery of the wheel 14. A front-wheel brake disc 16 is attached to a side surface of the wheel 14. A wheel speed detection device 20 having a wheel speed sensor 21 and a pulsar ring 22 is disposed on the side surface of the wheel 14.

  As shown in FIG. 2, the pulsar ring 22 has an annular shape and includes a large number of detection holes 221 at substantially equal intervals in the circumferential direction, and the wheel speed sensor 21 detects the detection holes 221, thereby The speed can be detected. The form of the pulsar ring 22 and the form of the detection hole 221 are not limited to those in FIG. 2. The pulsar ring 22 rotates in response to the rotation of the wheel, and the wheel speed sensor 21 detects the detection hole 221 of the pulsar ring 22. It only has to be like this.

  3 is a cross-sectional view taken along the line III-III in FIG. A wheel 14 is rotatably attached to the outer periphery of the axle 13 via a bearing 24. For convenience of description, the wheel 14 side in the axle direction is referred to as “inward in the axle direction” as indicated by “inward” in the drawing, and the front fork 12 side in the axle direction is referred to as “outward” in the drawing. This is referred to as “outward in the axle direction” and will be described below.

  The pulsar ring 22 has a hat-shaped cross section, and the outside in the radial direction protrudes outward in the axle direction. A step is provided on the outer peripheral surface of the outer end surface of the wheel 14 in the axle direction, and the pulsar ring 22 is attached to the step surface 14 a with a bolt 26.

  The mounting device 1 for the wheel speed sensor 21 includes a cylindrical collar 23 having a predetermined length L2 in the axle direction, and a sensor bracket 25 fitted to the outer peripheral surface of the enlarged diameter portion 23a of the collar 23. .

  The collar 23 is formed in a cylindrical shape, and an outward flange portion 23b is integrally formed at an outer end portion in the axle direction, and the diameter is increased by a predetermined length from the flange portion 23b inward in the axle direction. A portion 23a is formed.

  The collar 23 is fitted to the outer peripheral surface of the axle 13 and is disposed between the front fork 12 and the wheel 14, and the inner end surface 23 c of the collar 23 in the axle direction is the end surface of the inner race of the bearing 24. The outer end surface of the flange portion 23b in the axle direction is in contact with the inner end surface 12a of the front fork 12 in the axle direction. A recess 14 b serving as a bearing hole is provided on the inner peripheral surface of the outer end surface of the wheel 14 in the axle direction, and the bearing 24 is provided between the shaft 13 and the recess 14 b of the wheel 14. A seal 27 is fitted between the outer peripheral seal surface 23 d of the inner end of the collar 23 in the axle direction and the recess 14 b of the wheel 14.

  4 is a perspective view of the sensor bracket 25 portion, and FIG. 5 is a side view of the sensor bracket 25 portion. As shown in FIGS. 4 and 5, the sensor bracket 25 has an annular boss portion 25a that is fitted to the collar 23, and extends radially outward from the boss portion 25a. By doing so, a constricted arm portion 25b whose thickness is thinner than the axial thickness of the boss portion 25a and an ellipse shape at the tip of the arm portion 25b in a side view and projecting inward in the axle direction. A sensor mounting portion 25c having a protruding portion 25e, to which the wheel speed sensor 21 is mounted, and a non-rotating portion 25d that is narrower and shorter than the arm portion 25b protruding outward in the radial direction at a position different from the arm portion 25b are integrated. In preparation. On the outer end surface in the axle direction of the boss portion 25a, a first positioning surface A for positioning the sensor bracket 25 in the axle direction with respect to the collar 23 is planarized at a substantially right angle with the axle 13 (FIG. 3). Further, on the outer end surface in the axle direction of the sensor mounting portion 25c, the second positioning surface B for positioning the wheel speed sensor 21 with respect to the sensor bracket 25 in the axle direction is a plane substantially perpendicular to the axle 13 (FIG. 3). Has been processed. The first positioning surface A and the second positioning surface B are formed in the same plane that is substantially perpendicular to the axle direction.

  6 is a view taken in the direction of arrow VI as viewed from the front direction of FIG. As shown in FIG. 6, the detent 25d of the sensor bracket 25 is fixed to the front fork 12 by a bolt 121 on the inner side of the front fork 12, that is, the surface on the wheel 14 side, and the axle 13 (FIG. 3) and the front The sensor bracket 25 is prevented from rotating with respect to the fork 12.

  In FIG. 3, the boss portion 25 a of the sensor bracket 25 is fitted (press-fit) to the outer peripheral surface of the enlarged diameter portion 23 a of the collar 23 by an interference fit with a predetermined pressure, and the first positioning surface A is the collar 23. The flange portion 23b is in contact with the inner end surface in the axle direction.

  The wheel speed sensor 21 is inserted from the outside in the axle direction into the mounting hole 25c1 of the sensor mounting portion 25c of the sensor bracket 25 so as to face the pulsar ring 22 in the axle direction, and the flange portion 21a contacts the second positioning surface B. The bolt 28 is fixed in contact.

(About air gap stacking tolerance)
The stacking tolerance of the air gap G of the wheel speed sensor mounting device 1 according to the present embodiment will be described with reference to FIG. 3 and FIG. 4 which is a perspective view of the sensor bracket 25 portion and FIG. 5 which is a side view. The collar 23 and the sensor bracket 25 are separate from each other. As described above, the wheel positioning sensor 21 of the sensor bracket 25 and the first positioning surface A that is a contact surface of the sensor bracket 25 with the collar 23 are used. The sensor bracket 25 is formed so that the second positioning surface B which is a contact surface with the second positioning surface B is located on the same plane substantially perpendicular to the axle direction. As a result, the axial direction position of the sensor bracket 25 with respect to the collar 23 and the axial direction position of the sensor bracket 25 with respect to the wheel speed sensor 21 are fixed by the first positioning surface A and the second positioning surface B on the same plane. Therefore, the tolerance of the sensor bracket 25 itself is not added to the stacking tolerance on the wheel speed sensor 21 side. As a result, the stacking tolerance in the axle direction on the wheel speed sensor 21 side with respect to the wheel 14 is the tolerance of the axial dimension L1 of the bearing 24, and the axial dimension from the end surface 23c contacting the bearing 24 of the collar 23 to the first positioning surface A. The tolerance of L2 and the tolerance of the axial dimension L4 from the contact surface of the wheel speed sensor 21 with the sensor bracket 25, that is, the second positioning surface B to the end face of the wheel speed sensor 21 facing the pulsar ring 22 are added. It will be. On the other hand, the tolerance on the pulsar ring 22 side is the tolerance of the axial dimension L5 from the contact surface with the bearing 24 on the wheel 14 to the contact surface with the pulsar ring 22 and the tolerance of the axial dimension L6 of the pulsar ring 22. It will be added together. Therefore, the tolerance of the air gap G between the wheel speed sensor 21 and the pulsar ring 22 is the sum of all of the above. For example, if the tolerances of the dimensions L1, L2, and L5 are ± 0.1 mm and the tolerances of the dimensions L4 and L6 are ± 0.15 mm, the stacking tolerance of the air gap G is ± 0.6 mm. It becomes. Therefore, the first positioning surface A that is a contact surface with the collar 23 of the sensor bracket 25 and the second positioning surface B that is a contact surface with the wheel speed sensor 21 of the sensor bracket 25 are in the axle direction. Since the sensor bracket 25 is formed so as to be located on the same plane at a substantially right angle, the collar 23 and the sensor bracket 25 are separated, but the same as the conventional structure 2 in which the collar 23 and the sensor bracket 25 are integrated. The stacking tolerance of the air gap G can be reduced by ± 0.1 mm compared to the conventional structure 1.

  In the wheel speed sensor mounting device 1 according to the present embodiment, the collar 23 and the sensor bracket 25 are separated. Therefore, the collar 23 and the sensor bracket 25 are formed of materials according to their characteristics. The collar 23 needs strength to receive the axial force of the axle 13 and has an annular shape, and is formed, for example, by cutting out iron. Further, the sensor bracket 25 does not require strength and has a complicated shape because the wheel speed sensor 21 is attached. Therefore, the sensor bracket 25 is formed by casting aluminum, for example. When the collar 23 and the sensor bracket 25 are dissimilar members, the sensor bracket 25 is press-fitted into the collar 23. However, when the collar 23 and the sensor bracket 25 are the same kind of members, the sensor bracket 25 is welded to the collar 23 or the like. It is also possible to fix by this fixing method.

  According to the wheel speed sensor mounting device 1 having the above-described configuration, the following effects can be exhibited.

(1) The first positioning surface A of the sensor bracket 25 with the collar 23 and the second positioning surface B of the sensor bracket 25 with the wheel speed sensor 21 are, for example, the first positioning surface A and the second positioning surface. The sensor bracket 25 is formed so as to be positioned on the same plane substantially perpendicular to the axle direction by milling B at a time. Therefore, even if the collar 23 and the sensor bracket 25 are incorporated separately, the tolerance of the sensor bracket 25 is not added to the stacking tolerance of the wheel speed sensor 21, and the tolerance of the wheel speed sensor 21 is the tolerance of the collar 23. And the tolerance of the wheel speed sensor 21 is added. As a result, the stacking tolerance of the air gap G can be reduced as compared with the conventional structure 1 in which the collar 23 and the sensor bracket 25 are separated. In addition, the sensor bracket 25 and the collar 23 can be separated, and as a result, materials and manufacturing methods can be selected in accordance with the characteristics of each part. Compared to the conventional structure 2 in which the sensor bracket and the collar are integrated. While the air gap G has the same stacking tolerance, it is more manufacturable and economical.

(2) The outer side of the collar 23 in the axle direction has a diameter-enlarged portion 23 a having an enlarged outer diameter, and the sensor bracket 25 is attached to the outer peripheral surface of the diameter-enlarged portion 23 a of the collar 23. . That is, the inner diameter of the collar 23 mounting portion of the sensor bracket 25 is formed to match the outer diameter of the enlarged diameter portion 23 a of the collar 23. Here, since the outer diameter of the collar 23 on the outer peripheral seal surface 23d that contacts the seal 27 is smaller than the outer diameter of the enlarged diameter portion 23a, the outer peripheral seal of the collar 23 is attached when the collar 23 is attached to the sensor bracket 25 by press fitting. The surface 23d is difficult to contact the sensor bracket 25. As a result, the outer peripheral seal surface 23d of the collar 23 is hardly damaged. Further, since the outer diameter of the collar 23 on the outer peripheral seal surface 23d that is in contact with the seal 27 is smaller than the outer diameter of the enlarged diameter portion 23a, the collar 23 can be attached smoothly when the collar 23 is attached to the sensor bracket 25 by press fitting. Also, assembly workability is improved.

(3) The anti-rotation portion 25d of the sensor bracket 25 is fixed to the front fork 12 by a bolt 121 inside the front fork 12 in the axle direction. Accordingly, the anti-rotation portion 25d of the sensor bracket 25 is difficult to see from the outside, and the appearance is excellent. Further, even in a non-ABS vehicle, even when the front fork 12 is shared with that of an ABS vehicle, the mounting boss for the sensor bracket 25 provided on the front fork 12 is difficult to see from the outside, so that the appearance is excellent. Become. Further, even when the front fork 12 is not shared and only the mounting boss is formed in a nested manner, the parting line for mounting the mounting boss becomes difficult to see from the outside, and the appearance is improved.

(4) By mounting the wheel speed sensor mounting device 1 having the above-described configuration on the motorcycle 10, the accumulation tolerance of the air gap G of the wheel speed sensor mounting device 1 can be reduced, and the air gap G can be easily managed.

  In the present embodiment, an example in which the present invention is applied to the front wheel of the motorcycle 10 has been shown. However, the present invention can be applied to the rear wheel of the motorcycle 10 as well as the vehicle wheel for detecting the rotational speed. Widely applicable.

  Various modifications and changes can be made without departing from the spirit and scope of the invention as set forth in the appended claims.

  In the wheel speed sensor mounting device 1 according to the present invention, the collar 23 and the sensor bracket 25 are separated from each other, while maintaining the manufacturability and the economy, the stacking tolerance of the air gap G between the wheel speed sensor 21 and the pulsar ring 22 is maintained. Since the air gap G can be easily managed, the industrial utility value is great.

1 is a side view of a motorcycle 10 according to an embodiment of the present invention. It is an enlarged view of the pulsar ring 22 part of FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 2. It is a perspective view of a sensor bracket 25 portion. It is a side view of the sensor bracket 25 portion. FIG. 6 is a view taken in the direction of arrow VI in FIG. It is sectional drawing of the conventional wheel speed sensor attachment structure. It is sectional drawing of the conventional wheel speed sensor attachment structure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Wheel speed sensor mounting apparatus 10 Motorcycle 11 Front wheel 12 Front fork 12a End surface 121 Bolt 13 Axle 14 Wheel 14a Step surface 14b Recessed 15 Tire 16 Front-wheel brake disk 20 Wheel speed detection device 21 Wheel speed sensor 21a Flange part 22 Pulsar ring 221 Detection hole 23 Collar 23a Expanded diameter portion 23b Flange portion 23c End surface 23d Outer seal surface 24 Bearing 24a Inner race 25 Sensor bracket 25a Boss portion 25b Arm portion 25c Sensor mounting portion 25d Non-rotating portion 25e Protruding portion 26 Bolt 27 Seal 28 Bolt A First bolt 1 Positioning surface B 2nd positioning surface

Claims (4)

With respect to a pulsar ring fixed to a wheel rotatably supported on an axle, in a mounting device for a wheel speed sensor arranged with a predetermined gap in the axle direction,
A collar that is fitted to the outer peripheral surface of the axle and is positioned in the axle direction with respect to the wheel;
A sensor bracket that is fitted to the outer peripheral surface of the collar and to which the wheel speed sensor is attached;
The collar and the sensor bracket are separate bodies,
The sensor bracket is in contact with a locking surface formed on the collar to position the sensor bracket in the axle direction, and the wheel speed sensor is in contact with the wheel bracket. A second positioning surface for positioning in the axle direction of
The wheel speed sensor mounting device, wherein the first positioning surface and the second positioning surface are formed in the same plane substantially perpendicular to the axle.
The wheel speed sensor mounting device according to claim 1, wherein an outer diameter of the collar is larger than an outer diameter of the wheel side at a mounting portion of the sensor bracket.
The wheel speed sensor mounting device according to claim 1, wherein a rotation stop portion of the sensor bracket is fixed on a wheel side of a front fork that supports the axle.
  A motorcycle comprising the wheel speed sensor mounting device according to any one of claims 1 to 3.

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